 /*******************************************************************************
  * Copyright (c) 2003, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.part;

 import org.eclipse.core.resources.IFile;
 import org.eclipse.core.resources.IResourceChangeEvent;
 import org.eclipse.core.resources.IResourceChangeListener;
 import org.eclipse.core.resources.IResourceDelta;
 import org.eclipse.core.runtime.CoreException;
 import org.eclipse.core.runtime.IPath;
 import org.eclipse.ui.IInPlaceEditor;
 import org.eclipse.ui.IInPlaceEditorInput;

 /**
  * Adapter for making a file resource a suitable input for an in-place editor.
  * <p>
  * This class may be instantiated; it is not intended to be subclassed.
  * </p>
  *
  * @since 3.0
  */
 public class FileInPlaceEditorInput extends FileEditorInput implements
         IInPlaceEditorInput {
     IInPlaceEditor embeddedEditor;

     /**
      * A resource listener to update the input and in-place
      * editor if the input's file resource changes.
      */
     private IResourceChangeListener resourceListener = new IResourceChangeListener() {
         public void resourceChanged(IResourceChangeEvent event) {
             IResourceDelta mainDelta = event.getDelta();
             if (mainDelta != null && embeddedEditor != null) {
                 IResourceDelta affectedElement = mainDelta.findMember(getFile()
                         .getFullPath());
                 if (affectedElement != null) {
                     try {
                         processDelta(affectedElement);
                     } catch (CoreException exception) {
                         // Failed so close the receiver
 if (embeddedEditor != null) {
                             embeddedEditor.getSite().getPage().closeEditor(
                                     embeddedEditor, true);
                         }
                     }
                 }
             }
         }

         private boolean processDelta(final IResourceDelta delta)
                 throws CoreException {
             Runnable changeRunnable = null;

             switch (delta.getKind()) {
             case IResourceDelta.REMOVED:
                 if ((IResourceDelta.MOVED_TO & delta.getFlags()) != 0) {
                     changeRunnable = new Runnable () {
                         public void run() {
                             IPath path = delta.getMovedToPath();
                             IFile newFile = delta.getResource().getWorkspace()
                                     .getRoot().getFile(path);
                             if (newFile != null && embeddedEditor != null) {
                                 embeddedEditor
                                         .sourceChanged(new FileInPlaceEditorInput(
                                                 newFile));
                             }
                         }
                     };
                 } else {
                     changeRunnable = new Runnable () {
                         public void run() {
                             if (embeddedEditor != null) {
                                 embeddedEditor.sourceDeleted();
                                 embeddedEditor.getSite().getPage().closeEditor(
                                         embeddedEditor, true);
                             }
                         }
                     };

                 }

                 break;
             }

             if (changeRunnable != null && embeddedEditor != null) {
                 embeddedEditor.getSite().getShell().getDisplay().asyncExec(
                         changeRunnable);
             }

             return true; // because we are sitting on files anyway
 }
     };

     /**
      * Creates an in-place editor input based on a file resource.
      *
      * @param file the file resource
      */
     public FileInPlaceEditorInput(IFile file) {
         super(file);
     }

     /* (non-Javadoc)
      * @see org.eclipse.ui.IInPlaceEditorInput#setInPlaceEditor(org.eclipse.ui.IInPlaceEditor)
      */
     public void setInPlaceEditor(IInPlaceEditor editor) {
         if (embeddedEditor != editor) {
             if (embeddedEditor != null) {
                 getFile().getWorkspace().removeResourceChangeListener(
                         resourceListener);
             }

             embeddedEditor = editor;

             if (embeddedEditor != null) {
                 getFile().getWorkspace().addResourceChangeListener(
                         resourceListener);
             }
         }
     }
 }

